Apparatus for collecting soil samples



5 Sheets-Sheet 1 "ATTORNEYS Jan- 17, 1967 l-llsAMA'rsu sATo l APPARATUSFOR COLLECTING SOIL SAMPLES n Filed oct.' s, 1963 Jan.\17, 1967 lHl-sAMATsU sA'ro 3,298,450

Y APPARATUS FOR COLLECTING SOL SAMPLES Filed om. s, 1965 5 sheets-sheetzl Flg 5G.

INVENTOR ATTORNEY;

Jan 17, 1967 `r-llaAwl/n'su sATo 3,298,450

APPARATUS FOR COLLECTING SO`IL SAMPLES 3 Sheets-Sheet 5 Filed oct, v:5,1963 INVENTOR f//S f? ifsu 47? ATroRNEYj United States Patent O3,298,450 APPARATUS FOR COLLECTING SOIL SAMPLES Hisamatsu Sato, 3S-chome, Higashiyama-dori,

` Chikusa-ku, Nagoya, Japan Filed Oct. 3, 1963, Ser. No. 313,540tflairnsV priority, application Japan, Oct. 10, 1962,

- 37/45,043; Mar. 19, 1963, Sti/14,706

7 Claims. (Cl. 175-226) This invention relates to apparatus forcollecting samples when samples are gathered from earth strata ingeological surveys, and has for its object the provision of means topull up to the earths surface; samples of optional lengths whilemaintaining the actual soil strata formation. t n

In conducting a geological survey each hole is dug to the4 necessarydepth below the surface of the earth, ,the sample is raised up, and byobservations and tests the various physical and `dynamic characteristicsof earth strata are judged. Therefore it is necessary that the samplessupplied for this purpose remain identical to the formation of theground and also be as long and continuous as possible.

With the presently practiced sample collection methods, although it ispossible to obtain longrsamples, in View of the inability to enfold themin a watertight, airtight manner on the way as they are being pulled upto the earths surface, they may receive the effects of vacuum phenomena,or under water they may be washed away due to eddy currents. Sinceaccurate observations cannot be made the results of the tests tend tobecome inaccuratel n The present invention relates to an apparatus forcollecting soil samples in which such disadvantages have beeneradicated. n ,v p

, For a better understanding ofthe invention reference is taken to theaccompanying drawings, in which, l

FIG.` l is a vertical cross-sectional view of a prior apparatus in whichthe collected soil sample (hereinafter referred to as sample) is wrappedwith metal foil;

FIGS. 2 and 2a are enlarged cross-sectional views of that part of thesame apparatus which cuts-of and retains the sample;

FIGS. 3 and 3a are vertical cross-sectional views of a part of theapparatus of the present invention;

FIGS. 4 and 4a are horizontal cross-sectional views of the samplecutting-off part;

FIGS. 5 and 5a are vertical cross-sectional views of a second embodimentof the present invention;

FIGS. 6 and 6a arevertical cross-sectional views of a third embodimentof the present invention;

FIGS. 7 and 7a are cross-sectional views along A-A;

FIGS. 8 and 8a are vertical cross-sectional Views of a fourth embodimentof the present invention;

FIGS. 9 and 9a are vertical cross-sectional views of afifth embodimentof the present invention and FIGS.v 10 and 10a are verticalcross-sectional views of a sixth embodiment of the present invention.

In past collection of samples, such as for example with the apparatusdepicted -in FIG. 1, rotor 2 is caused to rotate about sampler 1,pressurized water is supplied into the space between 1 and 2, and as thehole is drilled by bit 4, the sample is caused to progressively enterinto interior 5 of sampler 1 and the sample is wrapped by a narrow longmetal foil 6. At the same time as shown in FIGS. 2 and 2a, due to aspring contrivance such as coil spring 7, steel band 8 is caused toadvance toward the center of the cross-section of the sample, thuscutting it off. Also a method is employed to support that end and pullit up to the earths surface, but according to this method the sample isnot wrapped up in a Watertight or airtight manner and will be disturbeddue to water and air. Also the end portion cannot avoid being washed outby disturbances such as vacuum and eddy currents.

The above facts are detailed in the following publication: Royal SwedishGeotechnical Institute Proceedings, No. l, Soil Sampler with MetalFoils, W. Kjellman, T. Kallstenius and O. Wager, Stockholm, 1950.

In the first embodiment of the present invention as depicted in FIGS. 3and 3a, there is shown two main parts inner cylinder 9 and outercylinder 10. Inner cylinder 9 is divided into head part 9a possessing athin cutting edge, and main part 9b. The joint of these two parts iscomprised of conical frustum surfaces fitting into each other and, sincethey may be `tted in coaxially, they can readily be separated from eachother. At the lower part of inner cylinder 9b and next to the joint isattached sample cutter 11, and immediately above it is the double walledcylinder for the purpose of forming the loading chamber 12 for thesample wrapping bag. At the upper end of loading chamber 12 is extensionoutlet 13 for the wrapping bag, facing toward the inside of innercylinder 9b. The inside diameter of inner cylinder 9b is slightly largerfrom above the extension outlet 13.

Into `loading chamber 12 cylindrical wrapping bag 14 is pushed,with theend of the bag closed by tying so that the entire lateral cross-sectionof inner cylinder 9b will be wrapped and sealed off. On the outer partof the head part 9a of the inner cylinder is located flange 15.

Overlapping inner cylinder 9 is outer cylinder 10 which can freelyrotate about the inner cylinder and which is equipped at its extremitywith bit 4 for drilling, and located near this and facing inward is aange for attaching bearing 16.

The head part of the inner cylinder near the joint increases in diameterso that, although outer cylinder 10 overlaps it with freely slidablerotation, the two parts cannot be mutually removed, and even when ballbearing 16 of the outer cylinder contacts outer flange 15, the cuttingedge of the head part of the inner cylinder will always protrude beyondouter cylinder 10.

Near ball bearing 16, on the inner surface of outer cylinder 10, arefour protrusions 17 facing inward. When outer cylinder 10 slidably movesso that the protrusions 17 are caused to engage with the indented andprotruding part 11 on the outside of the rotating ring meshed with thecut-off blades attached to main part 9b of the inner cylinder, and therotating ring of cutter 11 is rotated in the clockwise direction, asshown in FIGS. 4 and 4a the sixteen cut-off blades in four rows of thecutter move toward the center of the inner cylinder, cut off the sample,and moreover by means of the sixteen cutolf blades seal it within theinner cylinder.

Next the action of the apparatus of the present invention will beexplained.

In the first embodiment of the invention outer cylinder 10 overlapsinner cylinder 9, and while supplying pressurized water into the spacebetween inner cylinder 9 :and outer cylinder 10 and while pushing onouter cylinder 10, the periphery `of inner cylinder 9 is caused torotate in the clockwise direction, and outer cylinder 10 willprogressively dig into the earth.. In this instance flange 15, attachednear the lower extremity of the head part 9a of the inner cylinder, willbe pushed by ball bearing 16 near the internal extremity of outercylinder 10, and, yaccompanying progressive digging by outer cylinder10, will be pushed into the earth without rotation. At the same time thesample will progressively enter into the interior 5 of inner cylinder9a.l t

The sample which has entered into interior 5 of the head part of theinner cylinder will reach the upper extremity, which is shaped like aninverted U, of the wrapping bag 14 which slides out from the upperportion of wrapping `bag loading chamber 12 that is attached to thelower extremity of main part 9b of the inner cylinder. Moreover,accompanying entrance of the sample, its top and sides are coveredaccordingly by the bag and in this manner advances into the interior ofmain part 9b' of the inner cylinder. By filling the space between theibag and main part 9b of the inner cylinder with liquid of lubricat-ving characteristics such as soap solution, caustic soda solution or sometype of oil, friction is decreased together with prevention of injury tothe sample due to shock.

To raise the sample up to the surface of the earth, the supply of wateris stopped, rotation of outer cylinder is stopped, and if outer cylinder10 is moved until sloped surface 19 near the extremity of outer cylinder1t) touches slope surface on the outside of head part 9a of the innercylinder, projections 17 on the inside surface of outer cylinder 10 willengage teeth 11' which have been cut into the outer surface of the lowerend of the inner cylinder. At this point if outer cylinder 10 isgradually rotated in the clockwise direction, movable part 11 providedon inner cylinder 9 will rotate in unison. time, gear 21 on inner faceof movable part 11 rotates gear 22 which is integral with cut-off blades18 attached in four rows to the inner face of movable part 11, andcut-off blades 18 will bite into the sample, moving toward the center ofinner cylinder 9, and will cut-off the sarnple. When the tips of thecut-off blades reaches the center of the cross-sectional plane of thelinner cylinder, the extremities of cut-off blades 18 will abut againsteach other and outer cylinder 10 cannot be rotated further. Thus, thesixteen cut-off blades 18 which are provided in four rows willcompletely sever the sample and seal off the cut-olf face.

At this point if main part 9b of the inner cylinder is pulled up to theearths surface, the sample is wrapped around it and at the upper end bythe bag, while the lower end is sealed by cut-off blades 18, and thesample can be collected in this state.

Next the details of the second embodiment of the present invention willbe explained in conjunction with the drawing. As depicted in FIGS. 5 and5a, in the second embodiment of the present invention, inner cylinder 9,head part 9a, which possesses a thin cutting edge, and main part 9b areconnected together by an abutting sawtooth joint and can be separated.Also sample cutters 11 are provided on internal cylinders 9b zand 9arespectively. In other respects, it is identical to the firsternbodiment.

In the second embodiment of the present invention, if protruding partsof outer cylinder 10 and the indented and protruding part of the outerrotating ring of cutter 1 1 are 'caused to engage with each other andthen rotated in the clockwise direction, the top and bottom two rows ofcutters 11b and 11a will simultaneously cut-off the sample, and :at thesame time seal it just the same as in the first embodiment. Thus, whilecutting off with upper and lower two rows of cut-off blades, when mainpart 9b of the inner cylinder is pulled out from outer cylinder :10, thesample will be wrapped in wrapping bag 14, with its lower portionprotected by cut-off blades 18, and the sample can be collected in anundisturbed condition.

Also after main part 9b of the inner cylinder has been removed, headpart 9b of the inner cylinder remains in the earth, and since cut-offblades 18a of cutter 11a are hermetically closed, water or soil isprevented from invading into inner cylinder 9a.

After the sample in the main part 9b of the inner cylinder has beentaken out as above mentioned, Wrapping `bag 14 is packed into loadingchamber 12 `and the end is sealed off in an inverted U shape withcut-off blades 18h in hermetically closed position, and main part 9b ofthe inner cylinder is inserted into outer cylinder 10, and,

At this while quietly rotating in the clockwise direction, the partsinterconnecting main part 9b and head part 9a of the inner cylinder aremade to completely mesh together by means of the sawtootfh joint.

Subsequently if inner cylinder 9 is rotated in the counterclockwisedirection, the upper and lower cut-off blades will simultaneously openup. Next the sending of water is commenced, outer cylinder 10 is pusheddown, rotated, and collection of the next sample is conducted.

As aforementioned, in the first and second embodiments of the presentinvention, if the necessary length of wrapping bag 14 is loaded into theloading chamber 12, the above procedure can be continued and, no matterhow long the sample, it can be collected in continuous form and,moreover, in an undisturbed state. Also cutoff blades 18 will mutuallycontact each other to her metically seal the sample within the innercylinder and, because it will be cut-off from the exterior, there willbe no fear that the sample, while being pulled up, will sufferdisturbance or loss by washing out due to effects of vacuum phenomena oreddy currents during water immersion, and it is possible to collectperfect samples of earth strata, thus enabling conduction of effectivegeological surveys.

In the third embodiment of the present invention as` depicted in FIGS. 6and 6a, the inner surface of cylinder 9 has valve 25 with blades havingthin cutting edge tips and which are supported and free to rotate in arange from a position parallel to t-he cylinder wall to a direction atright angles to it, about sealing valve shaft (here-` inafter referredto -as shaft) 24, with chamber 12 constituting an integral part. Theextension outlet for bag 14 is located at the vicinity where the valvetips contact the inner wall of the cylinder.l

In order to collect a sample, bag 14 is com-pressed and' packed intochamber 12 and its end is sealed off. The head part of cylinder 9 isheld vertically in the ground or at the surface of the earth, and whenthe cylinder 9 is driven into the ground by striking its head with ahammer, the sample will progressively enter into cylinder 9. In thisinstance, if the valve is sealed cylinder 9, the sample willautomatically push the valve lblades against the inner wall of thecylinder, and as in FIG. 6a, will advance into the cylinder.

When the sample reaches the sealed off end of bag 14, the bag willautomatically, at the same speed as the entrance of soil and sand,extend out from chamber 12 and enfold the sample.

By continuing the above-mentioned yoperation the sam* ples of earthstrata formation will all be of cylindrical rod form and successivelystored in cylinder 9 as wrappedlin bag 14.

In this manner, when driving in to the specified depth has ended,vcylinder 9 is pulled up to the earths surface.v

When cylinder 9 is started to be pulled up, the sample within cylinder9, -by its own weight, will tend to drop outside from the lower end ofcylinder 9 but as soon as' even a small part of the sample shows atendency to drop outside, valve 25 which has been pushed against the'inner wall of cylinder 9 will, due to friction with the sample, rotateso as to lean tow-ard the center of cylinder4 tion where it will ybe atright angles to the central axis of cylinder 9, fand as'in FIG. 6, willclose off the interior-of cylinder 9 and completely prevent dropping outof the sample.

In the fourth embodiment of the present invention, as

depicted in FIGS. 8 and 8a, cylinders 9b and 9a Iare cou-V pled in aslidingly rotatable manner but will not come apart. At the lowerextremity of cylinder 9b is chamberl 12 and at its lower end is theextension outlet for bag 14. From above chamber 12 the cylinder issingle walled. .Also the extremity of cylinder 9a is a thin cutting edgewhile the upper portion is a partdoubly c-oupled to cylinder 9bwithvalve 25.1'n the inner face prolvided tomakewpossiblqfby rotationabout shaft'24, the

closing offof cylinder9a.

On the inner .faceof cylinder 9b,- at vthe lpartA opposite`tos,haft.24,is notch y26 and l.also at itsiextremity'is internalllange27.

` .Attheupper end-of cylinder 9a isiattached shaft f2.4

Valve 25 is hinged to shaft 24 and the rear face ofthe vshaft part`ofvalve 25A -is a.:protru,ding-part which `will engage with thenotchin'cylinder9b.

. 10 f and, toengage withange 27 onthe'i-nner face of cylin- :der 9b, isnotch 28..4 Y f t `In torder to collect the sam-ple, bag `14is-.compressed Aand `packed intochamber 12, and its end is sea-led'of.

i With cylinder 9a` on thebottom` andcylinder 9b- `at the top theyaremutually connected together, andwhen `placed vertically attthe earthssurface orinthe ground,

the lower` extremity of cylinder y:9b closely .contacts-.the

.ing-ly valve 2 5-is pushed .against the inner face of cyii'n- '3 [der9b and, as in FIG, 8a, vthe. interior of cylinder .9a

will be opened. At this point if tliefhead. of cylinder 9b is struck todrive-itinto the ground, the sampleenters vfrom cylinder 9a, intocylinder 9b, `reachesthesealed `off portion Vof bag 14, is shortlywrapped automatically by bag 14 and, enters into ,cylinder 9b. -In thismanner, when drivin-g in rto the specified. depth has ended, cylinders9b and 9.a,ar`e pulled u-p to the. earths surface.

-After'comrnencing t-o pull upcylinder 9b, at yabout the saine time itsinternal ange 27 contacts thelower face 28 of the external flange ofcylinder 9a, the lower face of notchf26 on cylinder9b'wi-llpush upagainst the lower face of the .gprotrudingypalrt on the rear face of theshaft part of Valve 25, and due to lever action valve 25 departs fromthe inner wall of cylinder 9b and` leansin a direction .at right anglesAtoward vthe center. of cylinder 9b, and `as in FIG. 8, will seal olftheinterior of cylinder-9b, thus preventing dropping out yofv thesamplefrom cylinder 9b and enabling its perfect collection.

In the fifth embodiment ofthe present invention, as i depicted in FIGS.9 and 9a, cylinders 9b and 9a, which are mutually freely slidablyrotatable-"are doubly connected, and form an integral body. In thisembodiment, differently from the fourth embodiment, valve shaft 24 isattached to cylinder 9b and valve 25 is caused to be closed "by pushingup with the extremity of cylinder 9a.

Now if cylinders 9b and 9a are joined together by overlapping as in FIG.9a, valve 25 is pushed against the inner wall of cylinder 9b by thetapered portion of cylinder 9a and the interior of cylinder 9b is open.In this condition, if the driving in work is continued, the same as withthe other embodiments, the samples will all be of round rod shape, `and.as wrapped by bag 14 will successively be stored within cylinder 9b.

When `driven in to the specified depth, if cylinder 9 is pulled up, theinternal flange 27 at its extremity will slide again-st the outersurface of cylinder 9a vand reach external ange 28 of cylinder 9a. Atthe same time, the tapered portion of cylinder 9a which had been pushingvalve 25 against the inside wall of cylinder 9b slides past below thefront face of valve 25, and valve 2.5 will commence to lean toward thecenter of cylinder 9b and finally as in the left 'hand side of FIG. 9,closes A olf cylinder 9b and completely prevents dropping out of thesample.

The sixth embodiment of the present invention is an instance where thepresent invention is employed in the rotary type and, as depicted inFIGS. l0 and 10a While delivering pressurized water 3 through the spacebetween soil sample collectingcylinder 10 and drilling cylinder 9.,drillingcylinder 9 is caused to rotate in the clockwise .direction.:lPressurized -water 3 passes through water `spray holes 29, spurts outin thevicinit-y of .drilling bits 4,'softeningearth strata randmakingVdri-lling progress easy, and return flows to the earths surface togetherwith'wastesoil andsand. 1 f Y Inthis: manner, Yasdrillingprogresses,lthe sample successively entersv into cylinder A9,and is automatically wrapped by the bag at the extensionoutlet ofthechamber,and-isstored-within the cylinder..

Whenidrilling hasprogressed to they speciiiedd'ept-h,

`:when the `cylinderi-sv`v pulled up,external'ange' 27 at the flowerextremity. of:l the, cylinder.: automatically engages -the 'protrudingpart on the-frontk face ofthe Vshaft part ofvalve25providedattheinnerface of outer cylinder 10,fand' sinceit. will bepulled-up inthis rnanner, valve ,52S .will sealfoff outer. cylinder .10.

whatrciaimisr 1. An apparatus for collectingsoil samples comprising Vacylinder having an outer portion", and an inner portionmounte'dfor-limited slidablemovement-within said outer portion; soilcutting means-located at one endof said inner portion andextendingoutwardly from the adjacent end of said outer` portion; vawrapping bag loading c hamberdisposed on the inner wall of said'cylinderand lspaced 'from .said end;` a wrapping bag partially disposed in saidchamber. and extending kacross said cylinder `in a plane perpendicularto the longitudinal axis thereof; a plurality of drill bits disposed onsaid adjacent endof said outer portion; and means disposed on saidcylinder to 'seal said soil4 sampleffrom 4the soilafter the-sample `hasentered said cylinder upon insertion of saidcylinderinto the soil, saidsealing means comprising a ring .rotatably mounted ion said innerportion, a plurality of cutting blades pivotallymounted on saidringnormally ,extending around the inner wall'thereofpand. adapted ,tovbe pivoted about one e'nd in alplaneperpendicular to thelongitudinalaxis-of l`said cylinder' to cut said sample and seal it from the soil'upon 'rotationof saidring, and means to actuate said sealing means.

`means comprises a plurality of protrusions extending from the innerwall of said outer portion and adapted to engage said ring to transmitrotation of said outer por- 'tion to said ring.

3. An apparatus for collecting soil samples comprising a cylinder havingan outer portion, and an inner portion mounted for limited slidablemovement within said outer portion, said inner .portion comprising anupper portion :on which said chamber is disposed, and a lower portion,adjacent ends of said upper portion and said lower por- 'tions forming asawtooth joint to quick detachably connect said portions; soil cuttingmeans located on said 'lower portion and extending outwardly from theadjacent end of said outer portion; a wrapping bag loading chamberdisposed on the inner wall of said cylinder and spaced from said end; awrapping bag partially disposed in said chamber and extending acrosssaid cylinder in a plane perpendicular to the longitudinal axis thereof;a plurality of drill bits disposed on said adjacent end of said outerportion; and means disposed on said cylinder to seal said soil samplefrom the soil after the sample has entered said cylinder upon insertionof said cylinder into the soil.

4. An apparatus for collecting soil samples compris- 2. The apparatus ofclaim 1l wherein said actuating end; a wrapping bag partially dis-posedin said chamber Iland extending across said cylinder in aplaneperpendicu- 2lar to the longitudinal axis thereof; and means disposed onsaid cylinder to seal said soil sample from the soil after 'the samplehas entered said cylinder upon insertion of `said cylinder into thesoil, said ysealing means comprising a plurality `of blades pivotallymounted on said cylinder and adapted to be moved from a normal positionparallel to said cylinder wall to a cutting and sealing positionperpendicular to said cylinder wall, the movement of the sample upwardinto said cylinder retaining said blades in their normal position andthefmovement of said cylinder upward from the soil, causing the sampleto engage said blades to cut the sample and seal it from the soil.

5. An apparatus for collecting soil samples comprising 'a cylinderhaving an outer portion, and an inner portion i 'mounted for limitedslidable movement within said outer portion; soil cutting means locatedat one end of said 'disposedon said cylinder to seal said soil sample.from I the soil after the sample has entered said cylinder uponinsertion of said cylinder into the soil, said sealing meanscomprisingfa plurality of cutting blades pivotally mounted on said innerportion and adapted to be pivoted from a normal position parallel tosaid cylinder wall to a cutting and sealing position perpendicular tosaid cylinder wall, l

and means on said outer portion adapted to engage and `move said bladesupon relative movement between said inner and outer portions,

6. An apparatus for collecting vsoil samples comprising ia cylinderhaving an outer portion, 'and an inner portion 'mounted for limited`slidable movement within said outer portion; soil cutting meanslocatedat one end of said vinner portion and'extendingl outwardly from theadjacent end'of said outer portion; a wrapping bag loading cham- `berdisposed on the inner wall of said cylinder and spaced from said end; awrapping bag partially disposed in said 'chamber and extending acrosssaid cylinder in a plane perpendicular to the longitudinal axis thereof;and means disposed onsaid cylinder to seal said soil sample from thesoil after the sample has entered `said cylinder upon insertion of saidcylinder into the soil, said sealing means comprising a plurality ofcutting blades pivotally mountvved on said outer portion and adapted tobe pivoted from a normal position parallel to Isaid cylinder wall-to acutting and sealing position perpendicular to said cylinder wall, theouter end of said inner portion'normially retaining 'said blades intheir normal position and releasing said blades upon relative movementbetween said inner and outer portions.

7.An apparatus for collecting soil samples comprising a cylinder havingan outer portion, and an inner portion mounted for limited slidablemovement within said outer portion; a soil cutting means located at oneend of said inner portion and extending outwardly from the adjacent endof said outer portion; a wrapping bag loading chamber disposed on theinner wall of said cylinder and spaced 'from saidl end; a wrapping bagpartially disposed in said 'chamber and extendingA across said cylinderina plane perpendicular to the longitudinal axis thereof;"and meansdisposed on said cylinder to seal said soil sample from the soil afterthe sample has entered said cylinder upon insertion vof said cylinderinto the soil, said sealing means comprising a plurality of cuttingblades pivotally mounted 'on said outer .portion and adapted to bepivoted from a normal position parallel to said cylinder wall to acutting 'and sealing position perpendicular to said cylinder wall, 'afirst projection extending from lone end of each of'said blade members,a projection extending from the outer wall of said inner portion adaptedto engage said rst projection to move said blades to their cutting andsealing position upon relative movement between said inner and outerportions.

References Cited by the Examiner UNITED STATES PATENTS '2,148,373

CHARLESE; OCONNELL,l Primary Examiner. R. E. FAVREAU, AssistantExaminer'.

1. AN APPARATUS FOR COLLECTING SOIL SAMPLES COMPRISING A CYLINDER HAVINGAN OUTER PORTION, AND AN INNER PORTION MOUNTED FOR LIMITED SLIDABLEMOVEMENT WITHIN SAID OUTER PORTION; SOIL CUTTING MEANS LOCATED AT ONEEND OF SAID INNER PORTION AND EXTENDING OUTWARDLY FROM THE ADJACENT ENDOF SAID OUTER PORTION; A WRAPPING BAG LOADING CHAMBER DISPOSED ON THEINNER WALL OF SAID CYLINDER AND SPACED FROM SAID END; A WRAPPING BAGPARTIALLY DISPOSED IN SAID CHAMBER AND EXTENDING ACROSS SAID CYLINDER INA PLANE PERPENDICULAR TO THE LONGITUDINAL AXIS THEREOF; A PLURALITY OFDRILL BITS DISPOSED ON SAID ADJACENT END OF SAID OUTER PORTION; ANDMEANS DISPOSED ON SAID CYLINDER TO SEAL SAID